#12876: Fix element and parent classes of Hom categories to be abstract, and
simplify the Hom logic.
------------------------------------------+---------------------------------
Reporter: nthiery | Owner: nthiery
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.4
Component: categories | Resolution:
Keywords: categories, Hom | Work issues: fix doctests and
segfaults
Report Upstream: N/A | Reviewers: Simon King
Authors: Nicolas M. Thiéry | Merged in:
Dependencies: #11521, #12215, #12313 | Stopgaps:
------------------------------------------+---------------------------------
Comment (by nthiery):
Hi Simon!
Replying to [comment:62 SimonKing]:
> I think implementing a `_an_element_` is easy enough that I can do it in
another reviewer patch. One thing doesn't work as described in the
documentation, though. It says that a homomorphism of Hecke algebras can
not only be obtained from a matrix (that works) but from an element of a
Hecke algebra (I suppose: An element of the codomain). However, this isn't
implemented.
>
> I am not competent to implement it. So, I suggest that I start with
implementing `_an_element_`, try to use the category framework on these
homsets (i.e., define the Element attribute), and very important: Make the
homsets unique upon pickling. Namely:
> {{{
> sage: M = ModularForms(Gamma0(7), 4)
> sage: H = Hom(M,M)
> sage: H is loads(dumps(H))
> False
> }}}
> so that by consequence several tests from the test suite fail.
Feel free to just skip the failing tests and mention them, say on #12879.
And thanks a lot for all the work you put in rebasing/finalizing this
patch! I'll try to look at it tomorrow.
Cheers,
Nicolas
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12876#comment:64>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
